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Journal articles
The reddening law of Type Ia Supernovae: separating intrinsic variability from dust using equivalent widths
N. Chotard
1
E. Gangler
1
G. Aldering
P. Antilogus
2
C. Aragon
S. Bailey
C. Baltay
S. Bongard
2
C. Buton
A. Canto
2
M. Childress
Y. Copin
1
H. K. Fakhouri
E. Y. Hsiao
M. Kerschhaggl
M. Kowalski
S. Loken
P. Nugent
K. Paech
R. Pain
2
E. Pecontal
3
R. Pereira
1
S. Perlmutter
D. Rabinowitz
K. Runge
R. Scalzo
G. Smadja
1
C. Tao
4
R. C. Thomas
B. A. Weaver
C. Wu
2
N. Chotard 1
Author
E. Gangler 1
Author
G. Aldering
Author
P. Antilogus 2
Author IdHAL : pierre-antilogus arXiv : https://arxiv.org/a/PierreAntilogus ORCID : https://orcid.org/0000-0002-0389-5706
C. Buton
Author
A. Canto 2
Author
M. Childress
Author
Y. Copin 1
Author IdHAL : yannick-copin arXiv : https://arxiv.org/a/ycopin ResearcherId : http://www.researcherid.com/rid/B-4928-2015 ORCID : https://orcid.org/0000-0002-5317-7518
S. Loken
Author
P. Nugent
Author
K. Paech
Author
R. Pain 2
Author IdHAL : reynald-pain ORCID : https://orcid.org/0000-0003-4016-6067
1
IPNL - Institut de Physique Nucléaire de Lyon (Campus LyonTech-la Doua
Bâtiment Paul DIRAC
4 Rue Enrico Fermi
69622 Villeurbanne Cedex - France)
- UCBL - Université Claude Bernard Lyon 1 (43, boulevard du 11 novembre 1918, 69622 Villeurbanne cedex - France)
- Université de Lyon (92 rue Pasteur - CS 30122, 69361 Lyon Cedex 07 - France)
- IN2P3 - Institut National de Physique Nucléaire et de Physique des Particules du CNRS (France)
- CNRS - Centre National de la Recherche Scientifique : UMR5822 (France)
2
LPNHE - Laboratoire de Physique Nucléaire et de Hautes Énergies (Barre 12-22, 1er étage 4 Place Jussieu 75252 Paris Cedex 05 - France)
- UPMC - Université Pierre et Marie Curie - Paris 6 (4 place Jussieu - 75005 Paris - France)
- IN2P3 - Institut National de Physique Nucléaire et de Physique des Particules du CNRS (France)
- UPD7 - Université Paris Diderot - Paris 7 (5 rue Thomas-Mann - 75205 Paris cedex 13 - France)
- CNRS - Centre National de la Recherche Scientifique : UMR7585 (France)
3
CRAL - Centre de Recherche Astrophysique de Lyon (9 Avenue Charles André 69561 ST GENIS LAVAL CEDEX - France)
- ENS Lyon - École normale supérieure - Lyon (15 parvis René Descartes - BP 7000 - 69342 Lyon Cedex 07 - France)
- UCBL - Université Claude Bernard Lyon 1 (43, boulevard du 11 novembre 1918, 69622 Villeurbanne cedex - France)
- Université de Lyon (92 rue Pasteur - CS 30122, 69361 Lyon Cedex 07 - France)
- CNRS - Centre National de la Recherche Scientifique : UMR5574 (France)
- INSU - CNRS - Institut national des sciences de l'Univers (INSU-CNRS 3 rue Michel-Ange, 75794 Paris Cedex 16 - France)
4
CPPM - Centre de Physique des Particules de Marseille (163, avenue de Luminy - Case 902 - 13288 Marseille cedex 09 - France)
- AMU - Aix Marseille Université : UMR7346 / UMR6550 / UMR6450 / URA6450 (Aix-Marseille Université Jardins du Pharo 58 Boulevard Charles Livon 13284 Marseille cedex 7 - France)
- IN2P3 - Institut National de Physique Nucléaire et de Physique des Particules du CNRS (France)
- CNRS - Centre National de la Recherche Scientifique : UMR7346 / UMR6550 / UMR6450 / URA6450 (France)
Abstract : We employ 76 type Ia supernovae with optical spectrophotometry within 2.5 days of B-band maximum light obtained by the Nearby Supernova Factory to derive the impact of Si and Ca features on supernovae intrinsic luminosity and determine a dust reddening law. We use the equivalent width of Si II {\lambda}4131 in place of light curve stretch to account for first-order intrinsic luminosity variability. The resultant empirical spectral reddening law exhibits strong features associated with Ca II and Si II {\lambda}6355. After applying a correction based on the Ca II H&K equivalent width we find a reddening law consistent with a Cardelli extinction law. Using the same input data, we compare this result to synthetic rest-frame UBVRI-like photometry in order to mimic literature observations. After corrections for signatures correlated with Si II {\lambda}4131 and Ca II H&K equivalent widths, and introducing an empirical correlation between colors, we determine the dust component in each band. We find a value of the total-to-selective extinction ratio, RV = 2.8 \pm 0.3. This agrees with the Milky Way value, in contrast to the low RV values found in most previous analyses. This result suggests that the long-standing controversy in interpreting SN Ia colors and their compatibility with a classical extinction law, critical to their use as cosmological probes, can be explained by the treatment of the dispersion in colors, and by the variability of features apparent in SN Ia spectra.
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Journal articles
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http://hal.in2p3.fr/in2p3-00610560
Contributor : Sylvie Flores <>
Submitted on : Friday, July 22, 2011 - 2:34:53 PM
Last modification on : Sunday, June 20, 2021 - 3:35:08 AM
Contributor : Sylvie Flores <>
Submitted on : Friday, July 22, 2011 - 2:34:53 PM
Last modification on : Sunday, June 20, 2021 - 3:35:08 AM
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Identifiers
- HAL Id : in2p3-00610560, version 1
- ARXIV : 1103.5300
- DOI : 10.1051/0004-6361/201116723
Collections
UPMC | INSU | IN2P3 | ENS-LYON | CPPM | CNRS | UNIV-PARIS7 | CRAL | UNIV-AMU | USPC | UNIV-LYON1 | SORBONNE-UNIVERSITE | IP2I | UDL | UNIV-PARIS | UP-SCIENCES | SU-TI | LPNHE | SU-SCIENCES
Citation
N. Chotard, E. Gangler, G. Aldering, P. Antilogus, C. Aragon, et al.. The reddening law of Type Ia Supernovae: separating intrinsic variability from dust using equivalent widths. Astronomy and Astrophysics - A&A, EDP Sciences, 2011, 529, pp.L4. ⟨10.1051/0004-6361/201116723⟩. ⟨in2p3-00610560⟩
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